ISENTROPIC MIXING IN THE ARCTIC STRATOSPHERE DURING THE 1992-1993 AND 1993-1994 WINTERS Academic Article uri icon

abstract

  • Dynamic isolation of the winter Arctic circumpolar vortex during 19921993 and 19931994 (the second and third northern hemisphere winters of the UARS mission) is studied using quasihorizontal isentropic trajectories. Ejection of vortex air and entrainment of midlatitude air into the vortex are quantified and compared with climatological values obtained from the analysis of 16 Arctic winters. A number of unusual features of both winters are discussed. The most notable features are the anomalous isolation experienced by the vortex during December 1992 and the unusual degree of isolation and persistence of the vortex during February and March of both years. The 19921993 winter season is the most consistently isolated vortex on record. Only during January 1993, when entrainment is large, is this pattern of extreme isolation broken. Copyright 1995 by the American Geophysical Union.

published proceedings

  • GEOPHYSICAL RESEARCH LETTERS

author list (cited authors)

  • DAHLBERG, S. P., & BOWMAN, K. P.

complete list of authors

  • DAHLBERG, SP||BOWMAN, KP

publication date

  • January 1, 1995 11:11 AM